Anterior segment changes during accommodation in eyes with a monofocal intraocular lens: High-frequency ultrasound study

“…To the best of our knowledge, this is the first report that describes the changes in ACA during accommodation (16) in subjects who underwent IOL implantation and whose mean age was 76 ± 6 years. After 3 D of accommodation, the ACA decreased by approximately 1.22 degrees at the horizontal meridian and by 0.75 degrees in the vertical direction.…”

Section: Anterior Chamber Anglementioning

confidence: 89%

“…Table 1 is a compilation of the results of all studies that evaluated at least one of these three eye metrics during accommodation. Studies assessing the changes in central ACD , mean ACA (16) , and PD (3,7,26,28,29) during accommodation concluded that these metrics decreased after increasing the stimulus vergence. Figure 1 The changes in the peripheral ACD and ACA at different meridians during accommodation have not been studied.…”

Section: Introductionmentioning

confidence: 99%

“…Quantifying the possible position-related changes in ACD could enable the development of new intraocular lenses (IOL) that preserve the anatomical structures (corneal endothelium, iris, or crystalline lens). Reports of studies assessing the changes in ACA along the horizontal and vertical meridians during accommodation are limited (16) . Further, …”

Section: Introductionmentioning

confidence: 99%

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Changes in anterior chamber eye during accommodation as assessed using a Dual Scheimpflug system

Domínguez‐Vicent¹,

Monsálvez-Romín²,

Albarrán-Diego³

et al. 2014

Arquivos Brasileiros De Oftalmologia

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Purpose: To study the changes in anterior chamber depth (ACD), anterior chamber angle (ACA), and pupil diameter (PD) during accommodation. Methods: Eighty eyes of 80 subjects, aged 22 to 40 years, were included. The rotating Dual Scheimpflug and a Placido disc system (Galilei G4, Ziemer Ophthalmic Systems AG, Switzerland) was used to measure the changes in ACD, ACA, and PD during accommodation. ACD measurement was taken for the central zone and for 4 more positions, each in different orientation (nasal, superior, temporal and inferior), 4 mm away from the centre. ACA was measured for the whole eye as well for the nasal, superior, temporal, and inferior quadrants. These metrics were obtained for various accommodation stimuli, ranging from +1 D to -4 D in 1-D steps. Results: For a given position, the ACD did not vary significantly with accommodation. For the central ACD, the percentage of relative change between far and near vision was -4.11%. The ACA was significantly lower at the inferior, temporal, and superior positions. There was no change in the ACA of the whole eye and that of the nasal orientation. These two eye metrics were significantly lower in the superior-nasal than in the inferior-temporal region. At each vergence studied, the PD decreased significantly with accommodation. The relative change after the -4 D stimulus was -8.13%. Conclusion: ACA and PD varied significantly with accommodation, whereas no such variation of ACD was observed. Further, the anterior chamber was found to be asymmetrical, with the nasal-superior area becoming significantly shallower than the inferior temporal region. Keywords

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“…These movements influence the IOL position, which undergoes modification during accommodative stimuli. 32 It is known that with eye axial elongation, many structures of the eye happen to have accompanied change including ciliary body and posterior iris. However, a study of ciliary muscle morphologic changes with accommodation in vivo deduced that the ciliary muscle was not found to be attenuated in myopic subjects as would be predicted from stretching alone, in fact, no significant relationship between ciliary muscle thickness and refractive error was identified.…”

Section: Discussionmentioning

confidence: 99%

The Analysis of Refraction and Accommodation of Extreme Myopia with Cataract after Phacoemulsification and IOL Implantation

Al-Wesabi¹,

Yang²,

Li³

et al. 2016

IOSR

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Abstract:Background: To assess the refractive status of cataract patients with extreme myopia and to measure their accommodative capability after monofocal IOL implantation. Design: Prospective non-randomized study conducted at Tianjin Medical University Eye Centre.Participants: 18 patients with 34 extreme myopic eyes ≥27mm axial length), and 14 patients with 27 non-myopic eyes that had uneventful phacoemulsification and monofocal IOL implantation. Methods:The accommodation amplitude of the two groups was compared pre-and post-operatively using subjective minus-lenses-to-blur method. In the extreme myopic group, the postoperative target refraction was selected to be myopic, and they were evaluated for predicted postoperative spherical power consistency.

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Anterior segment changes during accommodation in eyes with a monofocal intraocular lens: High-frequency ultrasound study

Abstract: Anterior segment structures demonstrated accommodative movement on UBM after implantation of standard monofocal IOLs.

Cited by 43 publications

References 30 publications

Comparison of visual results with accommodating intraocular lenses versus mini-monovision with a monofocal intraocular lens

Comparison of visual results with accommodating intraocular lenses versus mini-monovision with a monofocal intraocular lens

Changes in anterior chamber eye during accommodation as assessed using a Dual Scheimpflug system

The Analysis of Refraction and Accommodation of Extreme Myopia with Cataract after Phacoemulsification and IOL Implantation

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